Improvement in fire-proof roofs



UNITED STATES NIELs PoULsoN, 0F NEW, YORK, N.=Y.

IMPROVEMENT |N FIRE-PROOF RooFs.

Specification forming part of Letters Patent No. 139,607, dated J une 3,1873; application filed February 15, 1873.

To all uhom it may concern:

Beit known that I, NIELS POULSON, of the city, county, and State of NewYork, have invented a new and Improved Fire-Proof French Roof, of whichthe following is a speciiication: y y

Figure l is a frontview of my tire-proof French roof. Fig. 2 isfavertical transverse section of the same onthe line c 0,'Fig. 1.

Fig. 3 is a rear view, showing arrangement of plastering; and Fig. 4 ahorizontal section on the line x m, Fig. 2.

Similar letters of reference indicate corresponding parts. y

The object of my invention is to construct a strong, durable, andlire-proof French roof of cast metal, for the purpose of avoiding thecombustible material of which they a-re built at present, so that the reis communicated too rapidly from house to house, and discredit broughton the system of French roofs. The ornamental features of the same maythereby bepreserved, and at the same time full protectionlagainst thespread of lire rendered.

My invention consists of cast-iron plates of suitable size,joined-firmly together by means of outside ribs or caps and interiorbolt arrangement, representing an elegant front, impervious toatmospheric influences and absolutely fire-proof.

In the drawing, A represents the plates, forming the `principal part ofthe roof, made by preference of cast-iron, of suitable dimensions. Theymaybe cast on their outward side with ornaments corresponding to thestyle of architecture in which the building is designed, or in imitationof the plainer slate rooting, as indicated in Fig. l. Each plate A isprovided at the sides with longitudinal projectingfronttlanges a, andrear'flan ges b, which latter extend somewhat further back than those atthe front, so as to carry the wiregauze and plastering at properdistance from plates A. Should plates A be of larger width,

so that the wire-gauzestretched between the flanges is not suicientlyrigid to receive the plaster, it may be desirable to. cast intermediatelugs d. at regular intervals, so as to better support the plastering.Plates A are connected with the cornice andV gutter-pieces, braced, andare supported in the customary manner. Longitudinal ribs or cappings B`embrace the outer flanges a, at the joints of plates A, and have cast attheir inner sides at y ably, with putty, paper,felting, `or any otherpulpy, absorptive material, care being always taken that proper spacefor the expansion of the dili'erent parts is provided. .A net-work ofcoarse wiregauze, G, is stretched between the flanges b, and held inposition by being placed between the washer-clamps g and nuts h; also,if necessary, by supporting-lugs d and hooks t' placed therein, Fig. 4.'lhe plastering is spread over the wire-gauze in suilicient thickness.The in and outsides Aof plates A are coated with suitable paint, asprotection against the` weather.

Having thus describedmy invention, I l

claim as new and desire to secure by Letters'Patenti Plates A, havingfront and rear anges a andwb, held in connection with ribs B and ywire-gauze C by means of lugs e, bolts f,

washer-clamp g, and nutsh, forming the reproof French root,substantially as described.

NIELS POULSON.

Witnesses:

PAUL GOEPLE, T. B. MosHER.

